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CVE-2026-29772— Astro: Memory exhaustion DoS due to missing request body size limit in Server Islands

Quick assessment

Affected
withastro astro
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Astro是Astro开源的一个内容驱动网站的 web 框架。 Astro 10.0.0之前版本存在安全漏洞，该漏洞源于Server Islands POST处理程序无限制地缓冲和解析完整请求体为JSON，可能导致内存耗尽和服务器崩溃。

CVSS 5.9 · Medium EPSS 0.43% · P35

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2026-29772

Vulnerability Information
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Vulnerability Title
Astro: Memory exhaustion DoS due to missing request body size limit in Server Islands
Source: CVE Program / CVE List V5
Vulnerability Description
Astro is a web framework. Prior to version 10.0.0, Astro's Server Islands POST handler buffers and parses the full request body as JSON without enforcing a size limit. Because JSON.parse() allocates a V8 heap object for every element in the input, a crafted payload of many small JSON objects achieves ~15x memory amplification (wire bytes to heap bytes), allowing a single unauthenticated request to exhaust the process heap and crash the server. The /_server-islands/[name] route is registered on all Astro SSR apps regardless of whether any component uses server:defer, and the body is parsed before the island name is validated, so any Astro SSR app with the Node standalone adapter is affected. This issue has been patched in version 10.0.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Astro 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Astro是Astro开源的一个内容驱动网站的 web 框架。 Astro 10.0.0之前版本存在安全漏洞，该漏洞源于Server Islands POST处理程序无限制地缓冲和解析完整请求体为JSON，可能导致内存耗尽和服务器崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
withastro astro < 10.0.0 -

II. Public POCs for CVE-2026-29772

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III. Intelligence Information for CVE-2026-29772

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Vendor Advisories for CVE-2026-29772 (1)

Same Patch Batch · withastro · 2026-03-24 · 3 CVEs total

CVE-2026-33768 6.5 MEDIUM Astro: Unauthenticated Path Override via `x-astro-path` / `x_astro_path`
CVE-2026-33769 Astro: Remote allowlist bypass via unanchored matchPathname wildcard

IV. Related Vulnerabilities

Same product: astro
Same vendor: withastro
Same weakness: CWE-770

V. Comments for CVE-2026-29772

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